diff --git a/plugins/cron/index.test.ts b/plugins/cron/index.test.ts
new file mode 100644
index 0000000..ffe0b6f
--- /dev/null
+++ b/plugins/cron/index.test.ts
@@ -0,0 +1,252 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import { CronEventPayload, CronPlugin } from './index'
+import { getNextExecutionTime, parseCronExpression } from './utils'
+import { StarbaseApp } from '../../src/handler'
+import { DataSource } from '../../src/types'
+
+type MockApp = StarbaseApp & {
+    capturedMiddleware?: (c: any, next: () => Promise<void>) => Promise<void>
+    capturedPostHandler?: (c: any) => Promise<Response>
+}
+
+let cronPlugin: CronPlugin
+let mockDataSource: DataSource
+
+const createMockApp = () => {
+    const app = {
+        use: vi.fn((middleware) => {
+            app.capturedMiddleware = middleware
+        }),
+        post: vi.fn((_path, handler) => {
+            app.capturedPostHandler = handler
+        }),
+    } as MockApp
+
+    return app
+}
+
+let mockApp: MockApp
+
+beforeEach(() => {
+    vi.clearAllMocks()
+
+    mockDataSource = {
+        rpc: {
+            executeQuery: vi.fn().mockResolvedValue([]),
+            setAlarm: vi.fn().mockResolvedValue(undefined),
+        },
+    } as unknown as DataSource
+
+    cronPlugin = new CronPlugin()
+    mockApp = createMockApp()
+})
+
+afterEach(() => {
+    vi.restoreAllMocks()
+})
+
+describe('Cron utils', () => {
+    it('should parse valid cron expressions', () => {
+        const interval = parseCronExpression('*/5 * * * *')
+
+        expect(interval.next().getTime()).toEqual(expect.any(Number))
+    })
+
+    it('should calculate the next execution time after a timestamp', () => {
+        const after = new Date('2026-05-14T10:00:00.000Z').getTime()
+
+        const nextExecution = getNextExecutionTime('*/15 * * * *', after)
+
+        expect(nextExecution).toBe(
+            new Date('2026-05-14T10:15:00.000Z').getTime()
+        )
+    })
+})
+
+describe('CronPlugin - Initialization', () => {
+    it('should initialize with default values', () => {
+        expect(cronPlugin).toBeInstanceOf(CronPlugin)
+        expect(cronPlugin.pathPrefix).toBe('/cron')
+        expect(cronPlugin['eventCallbacks']).toHaveLength(0)
+    })
+})
+
+describe('CronPlugin - register()', () => {
+    it('should create the cron table and schedule alarms from middleware', async () => {
+        const next = vi.fn().mockResolvedValue(undefined)
+
+        await cronPlugin.register(mockApp)
+        await mockApp.capturedMiddleware?.(
+            { get: vi.fn(() => mockDataSource) },
+            next
+        )
+
+        expect(mockDataSource.rpc.executeQuery).toHaveBeenCalledWith({
+            sql: expect.stringContaining(
+                'CREATE TABLE IF NOT EXISTS tmp_cron_tasks'
+            ),
+            params: [],
+        })
+        expect(mockDataSource.rpc.executeQuery).toHaveBeenCalledWith({
+            sql: expect.stringContaining('SELECT name, cron_tab, payload'),
+            params: [],
+        })
+        expect(next).toHaveBeenCalledTimes(1)
+    })
+
+    it('should register a callback endpoint under the cron prefix', async () => {
+        await cronPlugin.register(mockApp)
+
+        expect(mockApp.post).toHaveBeenCalledWith(
+            '/cron/callback',
+            expect.any(Function)
+        )
+    })
+})
+
+describe('CronPlugin - scheduleNextAlarm()', () => {
+    it('should leave alarms untouched when no cron tasks exist', async () => {
+        cronPlugin['dataSource'] = mockDataSource
+
+        await cronPlugin['scheduleNextAlarm']()
+
+        expect(mockDataSource.rpc.executeQuery).toHaveBeenCalledWith({
+            sql: expect.stringContaining('SELECT name, cron_tab, payload'),
+            params: [],
+        })
+        expect(mockDataSource.rpc.setAlarm).not.toHaveBeenCalled()
+    })
+
+    it('should activate all tasks that share the earliest next execution time', async () => {
+        const now = new Date('2026-05-14T10:00:00.000Z').getTime()
+        vi.spyOn(Date, 'now').mockReturnValue(now)
+        vi.mocked(mockDataSource.rpc.executeQuery).mockResolvedValueOnce([
+            {
+                name: 'sync-customers',
+                cron_tab: '*/5 * * * *',
+                payload: '{}',
+            },
+            {
+                name: 'sync-orders',
+                cron_tab: '*/5 * * * *',
+                payload: '{}',
+            },
+            {
+                name: 'daily-report',
+                cron_tab: '0 11 * * *',
+                payload: '{}',
+            },
+        ])
+        cronPlugin['dataSource'] = mockDataSource
+
+        await cronPlugin['scheduleNextAlarm']()
+
+        expect(mockDataSource.rpc.executeQuery).toHaveBeenCalledWith({
+            sql: expect.stringContaining('UPDATE tmp_cron_tasks'),
+            params: [
+                'sync-customers',
+                'sync-orders',
+                null,
+                null,
+                null,
+                null,
+                null,
+                null,
+                null,
+                null,
+            ],
+        })
+        expect(mockDataSource.rpc.setAlarm).toHaveBeenCalledWith(
+            new Date('2026-05-14T10:05:00.000Z').getTime()
+        )
+    })
+})
+
+describe('CronPlugin - addEvent()', () => {
+    it('should insert the event payload and reschedule alarms', async () => {
+        vi.mocked(mockDataSource.rpc.executeQuery)
+            .mockResolvedValueOnce([])
+            .mockResolvedValueOnce([])
+        cronPlugin['dataSource'] = mockDataSource
+
+        await cronPlugin.addEvent(
+            '*/10 * * * *',
+            'lead-sync',
+            {
+                source: 'crm',
+            },
+            'https://example.com/cron'
+        )
+
+        expect(mockDataSource.rpc.executeQuery).toHaveBeenCalledWith({
+            sql: expect.stringContaining(
+                'INSERT OR REPLACE INTO tmp_cron_tasks'
+            ),
+            params: [
+                'lead-sync',
+                '*/10 * * * *',
+                JSON.stringify({ source: 'crm' }),
+                'https://example.com/cron',
+            ],
+        })
+        expect(mockDataSource.rpc.executeQuery).toHaveBeenCalledWith({
+            sql: expect.stringContaining('SELECT name, cron_tab, payload'),
+            params: [],
+        })
+    })
+
+    it('should throw when the plugin has not been initialized', async () => {
+        await expect(
+            cronPlugin.addEvent('*/10 * * * *', 'lead-sync', {}, '')
+        ).rejects.toThrow('CronPlugin not properly initialized')
+    })
+})
+
+describe('CronPlugin - onEvent()', () => {
+    it('should dispatch callback payloads through the callback route', async () => {
+        const callback = vi.fn()
+        const payload: CronEventPayload[] = [
+            {
+                name: 'sync-customers',
+                cron_tab: '*/5 * * * *',
+                payload: { source: 'crm' },
+            },
+            {
+                name: 'sync-orders',
+                cron_tab: '*/5 * * * *',
+                payload: { source: 'shop' },
+            },
+        ]
+        cronPlugin.onEvent(callback)
+        await cronPlugin.register(mockApp)
+
+        const response = await mockApp.capturedPostHandler?.({
+            req: { json: vi.fn().mockResolvedValue(payload) },
+        })
+
+        expect(callback).toHaveBeenCalledTimes(2)
+        expect(callback).toHaveBeenNthCalledWith(1, payload[0])
+        expect(callback).toHaveBeenNthCalledWith(2, payload[1])
+        await expect(response?.json()).resolves.toEqual({
+            result: { success: true },
+        })
+    })
+
+    it('should schedule async callbacks with waitUntil when context is provided', async () => {
+        const waitUntil = vi.fn()
+        const callback = vi.fn().mockResolvedValue(undefined)
+        const payload: CronEventPayload = {
+            name: 'sync-customers',
+            cron_tab: '*/5 * * * *',
+            payload: { source: 'crm' },
+        }
+        cronPlugin.onEvent(callback, {
+            waitUntil,
+        } as unknown as ExecutionContext)
+
+        await cronPlugin['eventCallbacks'][0](payload)
+
+        expect(callback).toHaveBeenCalledWith(payload)
+        expect(waitUntil).toHaveBeenCalledWith(expect.any(Promise))
+    })
+})